| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 95669 - Plymouth, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 38 | 41 | 43 | 49 | 54 | 59 | 58 | 55 | 49 | 41 | 36 | 47 |
| Avg Max Temp (°F) | 55 | 60 | 64 | 70 | 79 | 88 | 95 | 94 | 88 | 78 | 63 | 56 | 74 |
| Avg Precip (In.) | 6.62 | 5.28 | 5.05 | 2.48 | 1.37 | .4 | .08 | .09 | .49 | 1.61 | 3.85 | 4.98 | 32.31 |